Anomalous Magnetization of Two-Dimensional S = 1/2 Frustrated Square-Lattice Antiferromagnet (CuCl)LaNb₂O₇

Muon spin relaxation studies of the frustrated quasi-two-dimensional square-lattice spin systemCu(Cl,Br)La(Nb,TaUemura1, Aczel2, Ajiro3 et al. 2009Phys. Rev. BSelf Cite292150View full textAdd to dashboardCite

“…The magnetic susceptibility χ of this system, shown in Fig. 2, exhibits typical spin-gap behavior with an estimated gap ∆/k B = 27 K. The spin gap was directly observed by inelastic neutron scattering 11 and high-field magnetization 12 . The very small Weiss temperature Θ = J 1 + J 2 ≤ 5 K in the 1/χ plot ( Fig.…”

Ferromagnetically coupled dimers on the distorted Shastry-Sutherland lattice: Application to (CuCl)LaNb2O7

“…4 This suggests that, at least within the J -J x -J y model, the ground state should belong to the DS-II region as described in Fig. 3 and there should be substantial state is found for small |J x |,|J y | 0.5J , while the ferromagnetic state stabilizes for larger |J x | and |J y |.…”

Synchrotron X-ray diffraction study on the square-lattice antiferromagnets (CuCl)LaNb2O7 and Oba1, Kageyama2, Saito3 et al. 2007Journal of Magnetism and Magnetic Materials9071View full textAdd to dashboardCite

“…ðFeClÞLaNb 2 O 7 with S ¼ 2 undergoes a conventional antiferromagnetic order at 78 K, though there is an anomaly in the magnetic susceptibility at around 8 K [5]. An unusual behavior characterized by the spin liquid has been found in an S ¼ 1 2 system ðCuClÞLaNb 2 O 7 , where no long-range magnetic order exists even at 0 K and there is an energy gap of 2.3 meV between the spin-singlet ground state and the first excited triplet state [6,7]. Such a spin-liquid state on the square lattice is interesting in connection with the RVB state predicted by Anderson after the discovery of high T c superconductivity [8].…”